Fuel System
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- Check the fuel pressure. See FUEL SYSTEM DIAGNOSIS under FUEL SYSTEM CHECKS in BASIC DIAGNOSTIC PROCEDURES - 4.0L AURORA article.
- Check the fuel injectors. See FUEL INJECTOR COIL TEST and FUEL INJECTOR BALANCE TEST WITH SPECIAL TOOL or FUEL INJECTOR BALANCE TEST WITH TECH 2 under FUEL SYSTEM in SYSTEM & COMPONENT TESTS - 4.0L AURORA article.
- Check for fuel in the pressure regulator.
- Check the minimum idle speed.
- Check for items that cause the engine to run rich.